Steam-actuated exhaust-valve.



E. TURNER. STEAM AQTUATED EXHAUST VALVE.

APPLIGATION FILED No1/23o, 1910.

,042.846, Patented Oct. 29, 1912.

Vlialust valve held open by live steam from the UNITED v'STATES PATENTormoni.

ERNEST TURNER, OF'DADEVILLE, ALABAMA.

To all whom it mag/007206151.: y Y 4 Be it known that I, ERNEST TURNER,a citizen of the United States, residing at'l Dadeville, in the countyof Tallapoosa and State of Alabama, have invented certain new and usefulImprovements in Steam- Actuated Exhaust-Valves, of which the followingis a specification.

This inventionrelates to steam actuated valves and more particularly toan auxiliary exhaust valve Jfor use with any type ofv plain slidevalveengine, enabling said engine to usesteam expansvely to the bestadvantage by eliminating excess back pressureon the pist-on. Thisisaecomplished in the present/ instance by means of a `supplementary ex#working side of the piston so that exhaust ysteam may escape after themain exhaust'by way of the slide valve is closed, said auxiliary exhaustcontinuing until .the piston has nearly reached the end of itsstroke,leaving only sufficient steam in the cylinder to cushionv the piston.

The valve'is simple in construction and operation, comprises but onemovable part and works automatically at the beginning of each stroke ofthe piston. v

In the accompanyinr drawing which illustrates one embodiment of theinvention,- Figure 1 is alongitudinal sectional view of the deviceapplied to a steam cylinder, a portion only of which isshown; Fig. 2 isa sectional view on thc line 2-2 of Fig. l, and Fig. 3 is a like view onthe line l-S of the same figure. .i

ln the drawing, 10. indicates the cylinder of a steam engine which maybe supplied with inlet and exhaust valves ot any type; and as thesevalves torni no part oit' the present invention they have been omittedfrom the drawing. The cylinder is provided with the usual piston ll andis closed atvits ends by heads 12 and 13.

Bolted against the outer side of the cylinder 10 at any suitable pointis a casing 111, nearly as longv as the cylinder and formed with a.longitudinal opening 15 therethrough, preferably cylindrical, and closedateach end hy a head 1G. Flanges 17 are termed ou thecasing- 14 toreceive the fastening bolts, as shown in Figs. 2 and 3. Within thecasing 14 and rnear veach end is a port 18. opening through the sidewall of said casing adjacent the cylinder 10, said ports registeringSpecification of Letters 1Patent.

Patented Oct. 279,191?.

Application filed November 30, 1910..- Serial No. 594,897.

` so as to slide in unison, by a rod 24C of such length that when oneport 22 is closed by a piston, the other port Q2 will be open to permitthe escape of steam from the cylinder 1() into the casingT l5. The-ports18 in he casing are wider than, and surround the bushings so that thevpressure on the piston valves when the ports are closed will heequalized and thus prevent undue frictio.. and binding. A small port 25in eaclicylin# der head is connected by a pipe 26 with tti'e head 16closing the adjacent end et tlie casing `14, so that live steam from thecylinder lnay enter 'the casing behind the piston valves and operatethem. y The following` description will clearlv explain the operation oftlie'inv'ention. bThe piston 11 being' at the end of its stroke. say atthe left as seenin Fig. 1, will cover the port 1S) at that end of thecylinder. Steam entering the cylinder in the usual manner through theslidevalve, not shown.l passes into the space betweenvthe head 12 andthe i piston l1 to move the piston in the direction of the arrow. Someof the'steam enters the small port Q5 in the head 12 and passing throughthe connecting pipe 26 into the casing' 14, forces the piston valves tothe right or into the positionrepresented in Fig. l, thereby closingvthe port 22`at the leftand opening the like port at` the right of thecasing. Exhauststealn can then pass from 'the c vlinde. through theports 19, 18 and 22 into the casing' 14 and out through a suitable pipe27. The main exhaust i'tmust be understood. takes place through theslidevalve as usual. As the piston travels to` the right, the closedport 19 is uncovered, but escape of steam is prevented der as indicatedbyldotted lines, Fig. 1. The

steam remaining in the cylinder will bev compressed during the balanceof the stroke ardcushion the piston. The inletport at the right of thecylinder Will now be opened and live steam entering between the pistonand the cylinder head 13 will also pass through the small port S in thathead and the pipe 26 leading therefrom into' the casinfby l; and drivethe piston valves in the opposite direction so that exhaust may takeplace from the other end of the cylinder. By the use of this valve themain slide valve can be set to cut oil' at any part ot the stroke sothat the steam can be used expansively Without causingl back pressurethrough the early closing,` of the exhaustr port-s.

What l claim is:-

l. An auxiliary exhaustvalve Lir feiigiiie cylinders compri-singr acasing,I having a. live steam portand anexhaust steam port. at each endconnected to corresponding ends of the engine cylinder respectivelythrough openings in thel cylinder heads and Walls ot the' cylinder, anda reciprocating valve in said casing operated automatically' by the livesteam from the working side 'o't" the cylinder piston for opening, theexhaust port conimunicating with theopposite sideo'l the.

. cylinder piston and holding it open aiter the main exhaust is closed.

2. An auxiliary exhaust valve for engine cylinders comprising a casinghaving a li ri: steam port and anexhaust port at each end communicatingwith corresponding ends et' the engine cylinder respectively throughopenings in the cylinder heads and Walls of the cylinder, and a doublepiston reciprocatii'igir valve in said casing operated automatically at.the beginning ot' each cylinder piston stroke by live steam from theWorkinf; side of said piston for opening the exhaust port onl theexhaust side of the saine piston and holding it open after the mainexhaust is closed and until the stroke is about completed.

f5. An auxiliary exhaust valve for engine l cylinders comprising` acasing fastened to the cylinder, a double reciprocating valve in saidcasing adapted to4 alternately open and close'an exhaust port hear eachend of said cylinder, anda separate live steam port connecting each endof the cylinder to the corresponding end of the casing, whereby livesteam may enter the' easing fronrlhe cylinder and operate the valve.

4. An auxiliaryexhaust valve for engine cylinders comprising a casingfastened to the cylinder, ports connecting said cylinder and casing neartheir adjacent ends, a reeiprocating,` valve adapted to alternately opensaid ports for the passage oi exhaust steam from the cylinder, thepiston in the cylinder adapted to close said 'ports prior to the seatingof the valve, whereby said piston may be cushioned by the uneseapedexhaust, and other ports for conveying lire steam from the ends of thecylinder to the correspendingA ends ol the casing for operating saidvalve.

3. An auxiliary exhaust valve for engine cylinders comprising a `casingfastened to the* cylinder, registering ports in the'cylinder and casingnear their respective ends, a double piston valve adapted to alternatelyopen ,said ports for the passage ot exhaust steam into said casing,spaced pairs of bushes in the ends of said casing Within which saidvalves slide, the spaces between said pairs of bushes registeringwiththc ports in the casing, and a separate live steam port opening intoeach end of thecasing.

C. In combination, a cylinder, a piston adapted to reciprocate in saidcylinder, and an auxiliary exhaust valve for the cylinder coniprising` alcasing fastened to the cylinder, alined ports in the cylinder andcasing near their respective ends, double piston valve adapted toalternately open said ports for the passage of exhaust steam into saidcasing, the piston adapted to close said ports prior to the sealing),` ot' the valve whereby said piston is cushioned hy the unescaped exhaust,spaced pairs oit bushes in the ends of said casing?r within which saidvalves slide, the spaces between said pairs of' bushes registering withthe alined ports in the cyl inder and casing, and a separate live steamport opening into each end of the casing.

In testimony whereof I allix my signature in presence of two witnesses.

ERNEST TURNER.

Wi t-nesses F. P. VALLACE, J. H. 'Wynn'.

